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Groups > linux.kernel > #1608309
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [x86/mm/gup] 2947ba054a [ 71.329069] kernel BUG at include/linux/pagemap.h:151! |
| Date | 2017-03-24 12:00 +0100 |
| Message-ID | <tov6O-la-3@gated-at.bofh.it> (permalink) |
| References | <tmRXP-41x-1@gated-at.bofh.it> <touDM-64-15@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, Mar 24, 2017 at 01:24:36PM +0300, Kirill A. Shutemov wrote: > I'm not sure what is the best way to fix this. > Few options: > - Drop the VM_BUG(); > - Bump preempt count during __get_user_pages_fast(); > - Use get_page() instead of page_cache_get_speculative() on x86. > > Any opinions? I think I'm in favour of the first; either remove or amend to include irqs_disabled() or so. This in favour of keeping the variants of GUP down.
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Re: [x86/mm/gup] 2947ba054a [ 71.329069] kernel BUG at include/linux/pagemap.h:151! "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-24 11:30 +0100
Re: [x86/mm/gup] 2947ba054a [ 71.329069] kernel BUG at include/linux/pagemap.h:151! Peter Zijlstra <peterz@infradead.org> - 2017-03-24 12:00 +0100
Re: [x86/mm/gup] 2947ba054a [ 71.329069] kernel BUG at include/linux/pagemap.h:151! "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2017-03-24 13:00 +0100
Re: [x86/mm/gup] 2947ba054a [ 71.329069] kernel BUG at include/linux/pagemap.h:151! "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-27 17:40 +0200
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